Cycling Power to Weight Ratio Calculator
Estimate cycling watts per kilo and FTP-adjusted category from bodyweight, power, and test type.
Last updated: 2026-03-26
Estimate watts per kilo
Enter your values
Enter bodyweight, power, and the type of effort so you can compare absolute power and FTP-adjusted w/kg.
Estimated FTP w/kg
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Enter a rider weight and power test to estimate watts per kilo, FTP, and a broad rider category.
Calculation History(0)
Example calculations
Tap an example to prefill the calculator with sample values.
20-minute FTP test
75 kg rider averaging 285 watts
A standard field-test case where the 20-minute average is scaled to an estimated FTP.
Result: This is the most common scenario riders use when checking watts per kilo after a solo test effort.
Direct FTP entry
68 kg rider holding 260 watts at threshold
If you already know your FTP, you can score the current watts-per-kilo directly without any extra adjustment.
Result: Direct FTP entry is cleaner when the number comes from a recent tested or modeled threshold.
Imperial rider check
170 lb rider, 315 watts for 20 minutes
Useful when your scale and bike computer are already giving you pounds and watts.
Result: The calculator converts bodyweight internally so the final w/kg number stays comparable.
How cycling power to weight is estimated
The calculator converts bodyweight to kilograms when needed, then divides average power by bodyweight to produce watts per kilo. That gives you a simple bodyweight-adjusted performance number.
If the effort came from a 20-minute or 5-minute test rather than a true FTP effort, the calculator scales the power down to estimate FTP before assigning a broad rider category. That makes the output more useful for training comparisons.
Cycling watts-per-kilo FAQs
Use the estimate as a training benchmark, not as a complete prediction of race performance.
Why estimate FTP from a 20-minute test?
Because many riders can hold more power for 20 minutes than for a true hour-long threshold effort. Using about 95% of the 20-minute result is a common shorthand for estimating FTP.
What does watts per kilo actually tell me?
It shows how much power you produce relative to bodyweight. That matters most on climbs and accelerations where gravity is a big part of the resistance you are fighting.
Are the category labels official race classifications?
No. They are broad training-oriented reference bands. Real race performance depends on aerodynamics, repeatability, tactics, terrain, and much more than one w/kg number.
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